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Any wall located on a lot line between adjacent buildings, which is used or adapted for joint service between the two buildings, shall be constructed as a fire wall in accordance with Section 706. Party walls shall be constructed without openings and shall create separate buildings.
Exceptions:
  1. Openings in a party wall separating an anchor building and a mall shall be in accordance with Section 402.4.2.2.1.
  2. Party walls and fire walls are not required on lot lines dividing a building for ownership purposes where the aggregate height and area of the portions of the building located on both sides of the lot line do not exceed the maximum height and area requirements of this code. For the building official's review and approval, the official shall be provided with copies of dedicated access easements and contractual agreements that permit the owners of portions of the building located on either side of the lot line access to the other side for purposes of maintaining fire and life safety systems necessary for the operation of the building.
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Related Code Sections

706.1.1 Fire and Smoke Protection Features, Party Walls
as a fire wall in accordance with Section 706. Party walls shall be constructed without openings and shall create separate buildings. Exceptions ...
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